Carburetor



CARBURTOR.

' Filed Jan. 31, 1916 CHESTER' E JOHNSON 1 Patented Oct." 7, 1924.

p. gnns'rna r. JoHNso1\ ,-lor rumori", MIoHiGAN.

cAnBUnEfron.

I Application filed-January' 31, 1916.' Serial No. 75,396,

One' of the objects of this invention is to provide improved means, for producing an eiiicientv fuel mixture for internal combus-l tion engines, wherein the quality may be accurately controlled "for variable operating conditions-by 'automatic or manually operable devis. v

nother salient object of this inventionis to provide an improved `carbureting de- '20 vice, which, while eiiicient inloperation, easily lends itself to manufacture, and permits of a facile and accurate control under variable conditions.v

Broadly speaking, this invention may be said -to consist in the'provision of a c arburetor, .comprising a mixing chamber having pen ent valve devices therefor, the second ary air. valve being adapted' to be actuated 3 by the air flowing through the primary port.

This invention also consists of various ,other features of construction, all of which e will clearly appear from the following descriptiomtaken' inconnection with the ac- 'companying drawings, which form a part of this specification, and in which:

vFigure 1 is a vertical section through va carburetor, embodying a preferred form of this invention;

tially on the line 2-2 of Figure 1;

Figure' "3 is a 'fragmentary perspective view of the primary air valve operating lever; and Fi re 4 is a plan view of a sleeve valve mem n. Referring to the drawings, 1'0 represents a carburetor body having a downwardly ex.

tending integral tube 11 formed therein and providing a guide for a s'lidable sleeve valve 12, which is adapted to be mounted in its interior. The carburetor body is also provided vwith a pair of communicating opposed lateral ports 13, which, in the illustrated embodiment, form an intake for all of the air rimary and secondary air ports, inde- Figure 2 is a'transverse section, substan entering the'carburetor. A member or diaphragm 15 forms a lower wall 'for the carburetor and the upper wall, or'cover of the usual -floatchamben 4The diaphragmhas a central depressed portion or cup 16 formed 30 therein,and also. has ,upwardly extendin flanged portions'l," which are provided wit lateral primary airports 18,'whi'ch are -in f constant communication with they intake 13.' A- fuel. nozzle 19, having amouth o rfdis- 65 chargel port 20, 'and' inlet por-t4 21,V -i'f'shown as formed -integral -with the member 15. This member is also provided with an intey gral nipple 22 having an externally -threaded portion 23, to which the usual fuel feed pipe, not shown,-l may-be connectedf v A passage 24 may be formed in the interior 'of this nipple and is provided with a port 25 which is adapted to becontrolled by' any suitable valve mechanism, comprising av valve member26, andthe usual float 27, whichgmay bepivoted, as at 28, on the member '15. A' float chamberbowl or shell 29 may be se' cured in position by means ofa wing nut 30,'. which may have a threaded connection, as at 31, to the lower end of the` fuel nozzle 19.

A mixing or-'strangle tube 32, which may havea central portion tapering towards itsv lower end, and a laterally extending portion 33, on which may be vformed a downwardly extending i'lan'ge 34,. may be properly seated on a shoulder 35 formed on the 'central por'- tion of the member 15; Formed in the fiange 34 may be lateral ports36,which. are adapted to bebrought into 'and out' of registra'- 90 tion, with the ports 18 in the member 15, by amovement, suchas lrotation ofthe mixing tube 32, by means of a control v leverI 37, l comprising a handlev and ringportion '88, which is adaptedto'be' brazed, or lotherwise secured to the -mixing tube 32.

It will'be noted that the mixing chamber is lprovided with a laterally extending slot 39, through lwhich the handle of the v lever 37 extends. It will also be noted that an arcuatemember 39 may be formed integral with the handle portion of the lever 37, or suitably secured to it, this member being adapted to slide over the'interior surface o the mixing chamber, and at alll times to cover the slot 89 so that no air may be drawn therethrough into the interiorof the .mixing chamber.

' The usual throttle valve 40 may be arranged on a sha-,ft 41, which may be mounted 11G.

adjacent the outlet of the carburetor body l and is adapted to be controlled by the usual arm 42. lt will be noted that the sleeve valve 12 is provided interiorly thereof with a cage or spider 43, which may be formed integral therewith, or suitably secured thereto. This cage has transverse web portions 44 and a downwardly extending leg4 .45, on which may be arranged a plate 46 extending flange 48.

Having thus described the general construction and arrangement of the parts. the operation of my carburetor will beunderstood as follows: Assuming the throttle to be in substantially the position illustrated in Figure 1, and the motor to berunning under light load, the sleeve valve 12 will be in its lowermost position; namely, so that its bottom portion 47 will rest against the ring portion 38 of the mixing tube 32. and if the handle 37 is in the position shown in Figures 1 and 2, primary air will be drawn l in the carburetor at 13. flowing downwardly through the carburetor` thence through the" registering ports 18and 36. around the outside of the mixing tube 32 and upwardly through the mouth 49 formed between the discharge port 20- of the fuel nozzle and the mixing tube 32.

Of course'` it will be understood that as the air passes bythe mouth, of the nozzle,

fuel will be drawn therefrom, and after the .air'is mixed with the fuel, it will be then .drawn upwardly through the mixingtube and through the interior of the sleeve' 12 to the motor. ltis assumed that with the motor operating under the conditions just described', insufficient suction or vacuum is created to permit the liftingof the plate 46 bythe incoming primary air. However. if the suction of the motor is increased and the velocity of the incoming primary air is quickened. the force directed against the bottom of the plate`46 will be found suflicient to lift the plate and the auxiliary valve 12, thus gradually enlarging a port between the bottom. 47 of the sleeve valve 12. tube 11 and the laterally extending portion of the strangle tube 32.. rlhe auxiliary air will flow upwardly in the same manner -as -the mixture which is formed by the primary air and the fuel issuing from the fuel nozzle. and'will tend to lean this mixture. The amount of the opening` of the port 50 and the distance which the sleeve valve 12 and vthe plate 46 will be raised will. of course. depend on the flow of primary air, and when the quantity o-r velocity of this air decreases, the valve 12 will immediately rameau fall. So long as the velocity of the incoming primary air is constant, the height ofA the sleeve valve 12 is substantially stationary, because of the balance obtained between the weight of the valve and the upward'ilow of the primaryair.

It will also beunderstood that the raising and lowering action of the plate 46 performs the function of a valve in co-operation with the strangle tube 32, because of the tapered formation of the latter; that is. as the plate 46 rises, itnecessarily enlarges the unrestricted area of the interior of this tube.

lVhile l have described and illustrated an auxiliary air valve of sleeve construction,

which is adapted to be slidably arrangedin what l claim and desire by lietters Pat.

ent is:

1. ln a carburetor, the combination of a carbureting portion, provided with a 'bote tom having a central depressionmeans for conductingfuel into said chamber adjacent said depression. a downwardly tapering tube rotatably mounted in said chamber, and extending into said depression, a cylindrical valve slidably mounted kwithin the chamber and adapted to be raised by the flow of air through said tapering tube, said tube being' provided with means for-varying the flow-of air therethrough by a rotation thereof.

2. .ln a carburetor. the combination of a body. a float chamber secured thereto, the bottom of the body forming a cover for said float chamber and having a central depressed portion. a fuel nozzle adjacent said depressed portion, a tapering rotatable tube mounted in said bodv, and extending downwardly into said depressed portion. said bodv having a primary air port, said rota-' table tube being;` provided with means for depressed portion. a tapering rotatable tube mounted in said body. and extending downwardly into said depressed portion, said body having a primary air port, said rotatable tube being-provided'with means for varying the flow Aof air through said port, said body also being provided With a secondary air port, and a slidable sleeve' valve mechanisml for controlling said latter port, said sleeve valve mechanism being provided ivitli means whereby it" is actuated by the flow of air through said primary port.

4;. In a carburetor, the combination of a carburetor chamber having a bottom portion which is provided with a diaphragm having a downwardly extending central portion, a fuel nozzle arranged adjacent said central 1 portion, a cylindrical tube arrangedin said earbureting chamber having a lateral ail port formed therein, a sleeve valve slidabl-y mounted in said -tube andadapted tonormally close said air port, and a rotatable downwardly taperingtube arranged With-in l said Central portion, said earbureting-chamber being provided Witlranother air port,

said rotatable tube being providedwithmeans for controlling thetloiv of air there-- through. n

ln afar`b1lretor,the combination et a carburetor chamber having a bottom por' tion' which is provided with a'diaphragm lhaving a downwardly extending central portion, a fuel nozzle arranged adjacent:

said Central portion, a Cylindrical tube ar-'.l

ranged in said earbureting chamber having a lateral an' port formed therein, a sleeve valve slidably mounted in said tube and:

adapted to normally elose saidv air port, andl provided with means for 'controlling the -iow 'ofair therethrough, said sleeve .valve being adapted to be actuated by the flow of 'air through said latter mentioned port.

Intestimony whereof7V I affix my Signature,

CHESTER F. JOHNSON. 

